MOSCOW, Russia– May 23, 2012 – JSC SITRONICS announces that according to notice received from OJSC RTI, 36.548% of Company’s ordinary shares, including shares underlying the Company’s Depositary Receipts, have been offered for sale by SITRONICS’ minority shareholders under OJSC RTI’s Voluntary Tender Offer (“VTO”), which was launched to acquire up to 36.926% of SITRONICS’ ordinary shares from minority shareholders, and which was received by the Company on March 13, 2012.

The VTO acceptance period for SITRONICS shareholders expired yesterday, Tuesday, May 22, 2012.

The final results of the VTO will be announced when the shares offered for sale are transferred to OJSC RTI’s account at OJSC Reestr.